export function particle() {
	var canvas = document.querySelector("#particle"),
		ctx = canvas.getContext("2d");
	canvas.width = document.body.clientWidth;
	canvas.height = document.body.clientHeight;
	ctx.lineWidth = 0.3;
	ctx.strokeStyle = new Color(150).style;

	var mousePosition = {
		x: (30 * canvas.width) / 100,
		y: (30 * canvas.height) / 100,
	};

	var dots = {
		nb: 250,
		distance: 100,
		d_radius: 150,
		array: [],
	};

	function colorValue(min) {
		return Math.floor(Math.random() * 255 + min);
	}

	function createColorStyle(r, g, b) {
		return "rgba(" + r + "," + g + "," + b + ", 0.8)";
	}

	function mixComponents(comp1, weight1, comp2, weight2) {
		return (comp1 * weight1 + comp2 * weight2) / (weight1 + weight2);
	}

	function averageColorStyles(dot1, dot2) {
		var color1 = dot1.color,
		color2 = dot2.color;

		var r = mixComponents(color1.r, dot1.radius, color2.r, dot2.radius),
		g = mixComponents(color1.g, dot1.radius, color2.g, dot2.radius),
		b = mixComponents(color1.b, dot1.radius, color2.b, dot2.radius);
		return createColorStyle(Math.floor(r), Math.floor(g), Math.floor(b));
	}

	function Color(min) {
		min = min || 0;
		this.r = colorValue(min);
		this.g = colorValue(min);
		this.b = colorValue(min);
		this.style = createColorStyle(this.r, this.g, this.b);
	}

	function Dot() {
		this.x = Math.random() * canvas.width;
		this.y = Math.random() * canvas.height;

		this.vx = -0.5 + Math.random();
		this.vy = -0.5 + Math.random();

		this.radius = Math.random() * 2;

		this.color = new Color();
	}

	Dot.prototype = {
		draw: function () {
		ctx.beginPath();
		ctx.fillStyle = this.color.style;
		ctx.arc(this.x, this.y, this.radius, 0, Math.PI, false);
		ctx.fill();
		},
	};

	function createDots() {
		for (let i = 0; i < dots.nb; i++) {
		dots.array.push(new Dot());
		}
	}

	function moveDots() {
		for (let i = 0; i < dots.nb; i++) {
		var dot = dots.array[i];

		if (dot.y < 0 || dot.y > canvas.height) {
			dot.vx = dot.vx;
			dot.vy = -dot.vy;
		} else if (dot.x < 0 || dot.x > canvas.width) {
			dot.vx = -dot.vx;
			dot.vy = dot.vy;
		}
		dot.x += dot.vx;
		dot.y += dot.vy;
		}
	}

	function connectDots() {
		for (let i = 0; i < dots.nb; i++) {
		for (let j = 0; j < dots.nb; j++) {
			let i_dot = dots.array[i];
			let j_dot = dots.array[j];

			if (
			i_dot.x - j_dot.x < dots.distance &&
			i_dot.y - j_dot.y < dots.distance &&
			i_dot.x - j_dot.x > -dots.distance &&
			i_dot.y - j_dot.y > -dots.distance
			) {
			if (
				i_dot.x - mousePosition.x < dots.d_radius &&
				i_dot.y - mousePosition.y < dots.d_radius &&
				i_dot.x - mousePosition.x > -dots.d_radius &&
				i_dot.y - mousePosition.y > -dots.d_radius
			) {
				ctx.beginPath();
				ctx.strokeStyle = averageColorStyles(i_dot, j_dot);
				ctx.moveTo(i_dot.x, i_dot.y);
				ctx.lineTo(j_dot.x, j_dot.y);
				ctx.stroke();
				ctx.closePath();
			}
			}
		}
		}
	}

	function drawDots() {
		for (let i = 0; i < dots.nb; i++) {
		var dot = dots.array[i];
		dot.draw();
		}
	}

	function animateDots() {
		ctx.clearRect(0, 0, canvas.width, canvas.height);
		moveDots();
		connectDots();
		drawDots();

		requestAnimationFrame(animateDots);
	}

	canvas.addEventListener("mousemove", (e) => {
		mousePosition.x = e.pageX;
		mousePosition.y = e.pageY;
	});

	canvas.addEventListener("mouseleave", (e) => {
		mousePosition.x = canvas.width / 2;
		mousePosition.y = canvas.height / 2;
	});

	createDots();
	requestAnimationFrame(animateDots);
}